ENZYME

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ENZYME entry: EC 2.4.1.243

Accepted Name

6(G)-fructosyltransferase.

Alternative Name(s)

6(G)-FFT.

6(G)-fructotransferase.

6(G)-FT.

Fructan:fructan 6(G)-fructosyltransferase.

Reaction catalysed

(1-beta-D-fructofuranosyl-(2->1)-)(m+1) alpha-D-glucopyranoside + (1-beta-D-fructofuranosyl-(2->1)-)(n+1) alpha-D-glucopyranoside <=> (1-beta-D-fructofuranosyl-(2->1)-)(m) alpha-D-glucopyranoside + (1-beta-D-fructofuranosyl-(2->1)-)(n+1) beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0; n >= 0)

Comment(s)

This enzyme catalyzes the transfer of the terminal (2->1)-linked beta-D-fructosyl group of a mono- or oligosaccharide substituent on O-1 of the fructose residue of sucrose onto O-6 of its glucose residue.
For example, if 1-kestose (1(F)-(beta-D-fructofuranosyl)sucrose) is both the donor and recipient in the reaction shown above, i.e., if m = 1 and n = 1, then the products will be sucrose and 6(G)-di-beta-D- fructofuranosylsucrose.
In this notation, the superscripts F and G are used to specify whether the fructose or glucose residue of the sucrose carries the substituent; alternatively, this may be indicated by the presence and/or absence of primes.
Sucrose cannot be a donor substrate in the reaction (i.e. m cannot be zero) and inulin cannot act as an acceptor.
Side reactions catalyzed are transfer of a beta-D-fructosyl group between compounds of the structure 1(F)-(1-beta-D- fructofuranosyl)(m)-6(G)-(1-beta-D-fructofuranosyl)(n) sucrose, where m >= 0 and n = 1 for the donor, and m >= 0 and n >= 0 for the acceptor.

Cross-references

PROSITE

BRENDA

EC2PDB

ExplorEnz

PRIAM enzyme-specific profiles

2.4.1.243

KEGG Ligand Database for Enzyme Nomenclature